Year	Percent
1983-01-01	9.653210000000001
1984-01-01	11.760700000000000
1985-01-01	13.358700000000000
1986-01-01	20.146400000000000
1987-01-01	20.398700000000000
1988-01-01	21.264700000000000
1989-01-01	15.983600000000000
1990-01-01	14.550800000000000
1991-01-01	13.467000000000000
1992-01-01	15.014100000000000
1993-01-01	28.658900000000000
1994-01-01	35.921300000000000
1995-01-01	49.410700000000000
1996-01-01	42.795600000000000
1997-01-01	47.380900000000000
1998-01-01	48.617800000000000
1999-01-01	54.409200000000000
2000-01-01	35.985600000000000
2001-01-01	29.289900000000000
2002-01-01	23.719600000000000
2003-01-01	21.777200000000000
2004-01-01	19.502600000000000
2005-01-01	19.487800000000000
2006-01-01	22.873800000000000
2007-01-01	41.471800000000000
2008-01-01	39.211400000000000
2009-01-01	51.275800000000000
2010-01-01	50.612900000000000
2011-01-01	40.407000000000000
2012-01-01	32.053000000000004
2013-01-01	22.384600000000000
2014-01-01	24.171100000000000
2015-01-01	37.949900000000000
2016-01-01	48.907000000000000